Singlet Ground States in an OrganicS=1/2Spin Ladder and a Novel Double Spin Chain of Ferromagnetic Dimers Formed by an Organic Tetraradical
- 15 April 2000
- journal article
- Published by Physical Society of Japan in Journal of the Physical Society of Japan
- Vol. 69 (4) , 1008-1011
Abstract
We have synthesized the novel organic polyradicals BIP-BNO and BIP-TENO, which crystallize to form spin systems with a double spin chain, where BIP-BNO and BIP-TENO denote 3,5'-bis( N - t e r t -butylaminoxyl)-3',5-dibromobiphenyl and 3,3',5,5'-tetrakis( N - t e r t -butylaminoxyl)biphenyl, respectively. The crystals of BIP-BNO form a two-leg ladder of S =1/2 with antiferromagnetic legs and rungs. The ground state of this material is singlet. The BIP-TENO molecule includes S =1/2 spin pairs (dimers) in which the two spins are coupled ferromagnetically. The BIP-TENO crystals form a double spin chain consisting of dimers. All dimers interact antiferromagnetically with each other. This system can be regarded as an antiferromagnetic two-leg ladder when the dimer is taken as a unit. The ground state of this material is singlet and the existence of excitation gaps is suggested by the temperature dependence of the static magnetic susceptibility.Keywords
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